Development of the Coagulation Model for Humic Substances in Estuarine Condition

• SASAKI Akira

  Department of Civil Engineering, Graduate School of Engineering, Tohoku Universlty

• FUJII Manabu

  Department of Civil Engineering, Graduate School of Engineering, Tohoku Universlty

• WATANABE Toru

  Department of Civil Engineering, Graduate School of Engineering, Tohoku Universlty

• OMURA Tatsuo

  Department of Civil Engineering, Graduate School of Engineering, Tohoku Universlty

Bibliographic Information

Other Title

• 河口・沿岸域条件下におけるフミン物質の凝集モデルの構築

Abstract

Humic substances (HS) derived from terristrial area play important roles to supply essential minerals for the growth of aquatic organisms in estuaries. Therefore, the watershed management focusing on the transportation of essential minerals from terrestrial area to estuaries is needed for the conservation of estuarine ecosystem. Although it is said that a part of HS coagulates in estuaries with the increase of salinity, its mechanism has not been well-known. In this study, the coagulation model for humic substances in estuaries was developed on the basis of DLVO theory and hydrophobolic interaction which caused a strong attractive force between HS. This attractive force was estimated with hydrophobic index (E254/TOC) of HS and its molecular weight detected by gel chromatography analysis with 254nm spectrophotometer. The developed model could explainthe coagulation mechanism of humic acid according to the decrease of surface potential in estuarine condition. The result of simulation using this model showed that humic acid with intermediate molecular weight around 20k Da easily coagulated at the high salt concentration in estuaries.

Journal

• ENVIRONMENTAL ENGINEERING RESEARCH

  ENVIRONMENTAL ENGINEERING RESEARCH 41 377-387, 2004

  Japan Society of Civil Engineers

Keywords

• Humic Substance
• Coagulation
• Estuary
• DLVO Theory
• Hydrophobolic Attraction Force

Details

• CRID: 1390282679089500928
• NII Article ID: 130003949388
• DOI: 10.11532/proes1992.41.377
• ISSN: 1884829X
• ISSN: 13415115
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed